Address of Sir William Thompson. 273 
rendered superfluous for any one who desires only the essence 
of these investigations, with no more of detail than is necessary 
for a thorough and practical understanding of the subject. 
Terrestrial Magnetism. : 
Sabine’s Report of 18388 concludes with the following sen- 
ag 
and honorable undertaking.” An immediate result of this re- 
port was that the enterprise which it proposed was recommended 
0 the Government by a joint Committee of the British Asso- 
Clation and the Royal Society with such success, that Capt. 
ss was sent in command of the Erebus and Terror to 
ting and simplifying the correction of the marl 
rob] ree ‘a become one of vital impo 
